Re: Four Drive RAID-5 on RAIDFrame Considered Harmful...

Manuel Bouyer <[email protected]> Wed, 10 Oct 2007 20:45:15 +0200

Newsgroups	gmane.os.netbsd.devel.performance
Message-ID	<[email protected]>

On Tue, Oct 09, 2007 at 04:59:58PM -0700, Robert P. Thille wrote:
> [...]
> 
> I'm sort of disappointed at losing 25% of my storage, but the 
> performance loss just isn't worth it.  Would a hardware RAID card have 
> these issues, or do they do tricks with buffering or something to get 
> around it?

Hardware RAID are much faster, if they have a battery-backed cache and
can use write-back caching policy. With the write-back cache they can defer
the partial writes until they have enough data to do a full-stripe write.

-- 
Manuel Bouyer <[email protected]>
     NetBSD: 26 ans d'experience feront toujours la difference
--